Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0f4abafda89ea6…

MALICIOUS

PDF

45.5 KB Created: 2020-08-29 13:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5d87ec1ee308466836430c9fd74bd5 SHA-1: 6ad5658ab3a6af6dc2010b1aa6cadbb1ae8f9287 SHA-256: 0f0f4abafda89ea6c3c8826bf1ac429e7104851349a27f364df95fc8cfc2b395
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a redirector to malicious infrastructure. The presence of a "download button" heuristic and the ML classifier's high confidence further support malicious intent. The document body, though heavily obfuscated, contains the primary malicious URL and a list of other PDF links, suggesting a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=bookman+antiqua+font
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dec5066c5b74e60b54c8eea77a3ec30.pdf
    • https://static.usrfiles.com/ugd/b8c837_e54b86cf60b64225a2467883c843fc1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_79db1b3cedb34562867ac8531568f8aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_107871a511b54473afb38051ef128d10.pdf
    • https://static.usrfiles.com/ugd/b8c837_43908046ed7c433aa70d50bbaae0003a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2baf3123d5914fa188f56659c9d14a21.pdf
    • https://cdn.shopify.com/s/files/1/0437/5927/2090/files/kivejowisalariro.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/kefidubotafof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/6617556314.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/wunabafujulenakugajut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xabemefase.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/learn_spanish_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d0e.bin
d2abb2eb30f5984de387edb8026bf2b99b53f7911a71ddce376aef91cbef8280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0E 4844 bytes
font_01_sfnt_off00006d81.bin
a8f1e6131c53be6f737cc59735cb3a2f96ce2686d8e3b330331dafa82740c28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D81 11248 bytes
font_02_sfnt_off00009411.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9411 16084 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.